A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)
NSN 4140-01-396-4025
NSN 6220-01-574-2727
NSN 6130-01-519-8401
NSN 6105-01-051-1343
NSN 6685-00-225-8571
NSN 5960-01-023-8800
NSN 5960-00-613-1842
NSN 5835-01-319-4636
NSN 6620-00-244-0965
NSN 6135-01-032-8887
NSN 5950-01-441-2143
NSN 5990-01-443-2931